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Anatomy of Succulence and CAM in 15 Species of Senecio

A. Fioretto and A. Alfani
Botanical Gazette
Vol. 149, No. 2 (Jun., 1988), pp. 142-152
Stable URL: http://www.jstor.org/stable/2995362
Page Count: 11
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Anatomy of Succulence and CAM in 15 Species of Senecio
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Abstract

The ability of some species of the genus Senecio to perform Crassulacean acid metabolism (CAM) in plants growing both under controlled conditions and outdoors and the anatomy of their photosynthesizing organs, leaves, and/or stems were investigated. The studied species differed in leaf morphology and in degrees of leaf and stem succulence. Malate accumulation differed with environmental conditions. The carbon isotope ratio δ13C indicated that, in most of the species, the C3 carboxylation pathway was operating, although malate fluctuations indicated that CAM cycling occurred. In some species, carbon isotope ratios ranged between C3 and C4 values, indicating switching of photosynthetic pathways. Only two leafless species that were apparently obligate CAM species had a δ13C typical of plants assimilating CO2 through the phosphoenolpyruvate carboxylase pathway.

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